Round in MS SQL on 0.05 or 0.00

Question

Hello I am coming from Bosnia and Herzegovina and in our county the smallest note bill is 0.05, Now the government pushing us to our retrial prices rounding on 0.05 or at 0.00

Answer 1

Thanks to marc_s, i changed to money datatype.

float vs decimal vs money datatype article and flowchart

ALTER FUNCTION dbo.ufnRound (@number money)
RETURNS money
AS
BEGIN
    RETURN FLOOR(@number*20) / 20
END
GO
SELECT dbo.ufnRound (1.22), dbo.ufnRound (1.23), dbo.ufnRound (1.27), dbo.ufnRound (1.28)

-- gives    1.2    1.2   1.25   1.25